A high-performance potassium metal battery using safe ionic liquid electrolyte.

ABSTRACT: Potassium secondary batteries are contenders of next-generation energy storage devices owing to the much higher abundance of potassium than lithium. However, safety issues and poor cycle life of K metal battery have been key bottlenecks. Here we report an ionic liquid electrolyte comprising 1-ethyl-3-methylimidazolium chloride/AlCl₃/KCl/potassium bis(fluorosulfonyl) imide for safe and high-performance batteries. The electrolyte is nonflammable and exhibits a high ionic conductivity of 13.1 mS cm^-1 at room temperature. A 3.6-V battery with K anode and Prussian blue/reduced graphene oxide cathode delivers a high energy and power density of 381 and 1,350 W kg^-1, respectively. The battery shows an excellent cycling stability over 820 cycles, retaining ∼89% of t

SUBMITTER: Sun H 

PROVIDER: S-EPMC7668001 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature